/**
 *  author:		Timothy Groves - http://www.brandspankingnew.net
 *	version:	1.2 - 2006-11-17
 *              1.3 - 2006-12-04
 *              2.0 - 2007-02-07
 *              2.1.1 - 2007-04-13
 *              2.1.2 - 2007-07-07
 *              2.1.3 - 2007-07-19
 *
 */


if (typeof(bsn) == "undefined")
    _b = bsn = {};


if (typeof(_b.Autosuggest) == "undefined")
    _b.Autosuggest = {};
else
    alert("Autosuggest is already set!");












_b.AutoSuggest = function (id, param)
{
    // no DOM - give up!
    //
    if (!document.getElementById)
        return 0;
	
	
	
	
    // get field via DOM
    //
    this.fld = _b.DOM.gE(id);

    if (!this.fld)
        return 0;
	
	
	
	
    // init variables
    //
    this.sInp 	= "";
    this.nInpC 	= 0;
    this.aSug 	= [];
    this.iHigh 	= 0;
	
	
	
	
    // parameters object
    //
    this.oP = param ? param : {};
	
    // defaults
    //
    var k, def = {
        minchars:1,
        meth:"get",
        varname:"input",
        className:"autosuggest",
        timeout:2500,
        delay:500,
        offsety:-5,
        shownoresults: true,
        noresults: "No results!",
        maxheight: 250,
        cache: true,
        maxentries: 25
    };
    for (k in def)
    {
        if (typeof(this.oP[k]) != typeof(def[k]))
            this.oP[k] = def[k];
    }
	
	
    // set keyup handler for field
    // and prevent autocomplete from client
    //
    var p = this;
	
    // NOTE: not using addEventListener because UpArrow fired twice in Safari
    //_b.DOM.addEvent( this.fld, 'keyup', function(ev){ return pointer.onKeyPress(ev); } );
	
    this.fld.onkeypress 	= function(ev){
        return p.onKeyPress(ev);
    };
    this.fld.onkeyup 		= function(ev){
        return p.onKeyUp(ev);
    };
	
    this.fld.setAttribute("autocomplete","off");
};
















_b.AutoSuggest.prototype.onKeyPress = function(ev)
{
	
    var key = (window.event) ? window.event.keyCode : ev.keyCode;



    // set responses to keydown events in the field
    // this allows the user to use the arrow keys to scroll through the results
    // ESCAPE clears the list
    // TAB sets the current highlighted value
    //
    var RETURN = 13;
    var TAB = 9;
    var ESC = 27;
	
    var bubble = 1;

    switch(key)
    {
        case RETURN:
            this.setHighlightedValue();
            bubble = 0;
            break;

        case ESC:
            this.clearSuggestions();
            break;
    }

    return bubble;
};



_b.AutoSuggest.prototype.onKeyUp = function(ev)
{
    var key = (window.event) ? window.event.keyCode : ev.keyCode;
	


    // set responses to keydown events in the field
    // this allows the user to use the arrow keys to scroll through the results
    // ESCAPE clears the list
    // TAB sets the current highlighted value
    //

    var ARRUP = 38;
    var ARRDN = 40;
	
    var bubble = 1;

    switch(key)
    {


        case ARRUP:
            this.changeHighlight(key);
            bubble = 0;
            break;


        case ARRDN:
            this.changeHighlight(key);
            bubble = 0;
            break;
		
		
        default:
            this.getSuggestions(this.fld.value);
    }

    return bubble;
	

};








_b.AutoSuggest.prototype.getSuggestions = function (val)
{
	
    // if input stays the same, do nothing
    //
    if (val == this.sInp)
        return 0;
	
	
    // kill list
    //
    _b.DOM.remE(this.idAs);
	
	
    this.sInp = val;
	
	
    // input length is less than the min required to trigger a request
    // do nothing
    //
    if (val.length < this.oP.minchars)
    {
        this.aSug = [];
        this.nInpC = val.length;
        return 0;
    }
	
	
	
	
    var ol = this.nInpC; // old length
    this.nInpC = val.length ? val.length : 0;
	
	
	
    // if caching enabled, and user is typing (ie. length of input is increasing)
    // filter results out of aSuggestions from last request
    //
    var l = this.aSug.length;
    if (this.nInpC > ol && l && l<this.oP.maxentries && this.oP.cache)
    {
        var arr = [];
        for (var i=0;i<l;i++)
        {
            if (this.aSug[i].value.substr(0,val.length).toLowerCase() == val.toLowerCase())
                arr.push( this.aSug[i] );
        }
        this.aSug = arr;
		
        this.createList(this.aSug);
		
		
		
        return false;
    }
    else
    // do new request
    //
    {
        var pointer = this;
        var input = this.sInp;
        clearTimeout(this.ajID);
        this.ajID = setTimeout( function() {
            pointer.doAjaxRequest(input)
        }, this.oP.delay );
    }

    return false;
};





_b.AutoSuggest.prototype.doAjaxRequest = function (input)
{
    // check that saved input is still the value of the field
    //
    if (input != this.fld.value)
        return false;
	
	
    var pointer = this;
	
	
    // create ajax request
    //
    if (typeof(this.oP.script) == "function")
        var url = this.oP.script(encodeURIComponent(this.sInp));
    else
        //var url = this.oP.script+this.oP.varname+"="+encodeURIComponent(this.sInp);
        var url = this.oP.script+""+encodeURIComponent(this.sInp);
	
    if (!url)
        return false;
	
    var meth = this.oP.meth;
    var input = this.sInp;
	
    var onSuccessFunc = function (req) {
        pointer.setSuggestions(req, input)
    };
    var onErrorFunc = function (status) {
        alert("AJAX error: "+status);
    };

    var myAjax = new _b.Ajax();
    myAjax.makeRequest( url, meth, onSuccessFunc, onErrorFunc );
};





_b.AutoSuggest.prototype.setSuggestions = function (req, input)
{
    // if field input no longer matches what was passed to the request
    // don't show the suggestions
    //
    if (input != this.fld.value)
        return false;
	
	
    this.aSug = [];
	
	
    if (this.oP.json)
    {
        var jsondata = eval('(' + req.responseText + ')');
		
        for (var i=0;i<jsondata.results.length;i++)
        {
            this.aSug.push(  {
                'id':jsondata.results[i].id,
                'value':jsondata.results[i].value,
                'info':jsondata.results[i].info
            } );
        }
    }
    else
    {

        var xml = req.responseXML;
	
        // traverse xml
        //
        var results = xml.getElementsByTagName('results')[0].childNodes;

        for (var i=0;i<results.length;i++)
        {
            if (results[i].hasChildNodes())
                this.aSug.push(  {
                    'id':results[i].getAttribute('id'),
                    'value':results[i].childNodes[0].nodeValue,
                    'info':results[i].getAttribute('info')
                } );
        }
	
    }
	
    this.idAs = "as_"+this.fld.id;
	

    this.createList(this.aSug);

};














_b.AutoSuggest.prototype.createList = function(arr)
{
    var pointer = this;
	
	
	
	
    // get rid of old list
    // and clear the list removal timeout
    //
    _b.DOM.remE(this.idAs);
    this.killTimeout();
	
	
    // if no results, and shownoresults is false, do nothing
    //
    if (arr.length == 0 && !this.oP.shownoresults)
        return false;
	
	
    // create holding div
    //
    var div = _b.DOM.cE("div", {
        id:this.idAs,
        className:this.oP.className
        });
	
    var hcorner = _b.DOM.cE("div", {
        className:"as_corner"
    });
    var hbar = _b.DOM.cE("div", {
        className:"as_bar"
    });
    var header = _b.DOM.cE("div", {
        className:"as_header"
    });
    header.appendChild(hcorner);
    header.appendChild(hbar);
    div.appendChild(header);
	
	
	
	
    // create and populate ul
    //
    var ul = _b.DOM.cE("ul", {
        id:"as_ul"
    });
	
	
	
	
    // loop throught arr of suggestions
    // creating an LI element for each suggestion
    //
    for (var i=0;i<arr.length;i++)
    {
        // format output with the input enclosed in a EM element
        // (as HTML, not DOM)
        //
        var val = arr[i].value;
        var st = val.toLowerCase().indexOf( this.sInp.toLowerCase() );
        var output = val.substring(0,st) + "<em>" + val.substring(st, st+this.sInp.length) + "</em>" + val.substring(st+this.sInp.length);
		
		
        var span 		= _b.DOM.cE("span", {}, output, true);
        if (arr[i].info != "")
        {
            var br			= _b.DOM.cE("br", {});
            span.appendChild(br);
            var small		= _b.DOM.cE("small", {}, arr[i].info);
            span.appendChild(small);
        }
		
        var a 			= _b.DOM.cE("a", {
            href:"#"
        });
		
        var tl 		= _b.DOM.cE("span", {
            className:"tl"
        }, " ");
        var tr 		= _b.DOM.cE("span", {
            className:"tr"
        }, " ");
        a.appendChild(tl);
        a.appendChild(tr);
		
        a.appendChild(span);
		
        a.name = i+1;
        a.onclick = function () {
            pointer.setHighlightedValue();
            return false;
        };
        a.onmouseover = function () {
            pointer.setHighlight(this.name);
        };
		
        var li = _b.DOM.cE(  "li", {}, a  );
		
        ul.appendChild( li );
    }
	
	
    // no results
    //
    if (arr.length == 0 && this.oP.shownoresults)
    {
        var li = _b.DOM.cE(  "li", {
            className:"as_warning"
        }, this.oP.noresults  );
        ul.appendChild( li );
    }
	
	
    div.appendChild( ul );
	
	
    var fcorner = _b.DOM.cE("div", {
        className:"as_corner"
    });
    var fbar = _b.DOM.cE("div", {
        className:"as_bar"
    });
    var footer = _b.DOM.cE("div", {
        className:"as_footer"
    });
    footer.appendChild(fcorner);
    footer.appendChild(fbar);
    div.appendChild(footer);
	
	
	
    // get position of target textfield
    // position holding div below it
    // set width of holding div to width of field
    //
    var pos = _b.DOM.getPos(this.fld);
	
    div.style.left 		= pos.x + "px";
    div.style.top 		= ( pos.y + this.fld.offsetHeight + this.oP.offsety ) + "px";
    div.style.width 	= this.fld.offsetWidth + "px";
	
	
	
    // set mouseover functions for div
    // when mouse pointer leaves div, set a timeout to remove the list after an interval
    // when mouse enters div, kill the timeout so the list won't be removed
    //
    div.onmouseover 	= function(){
        pointer.killTimeout()
    };
    div.onmouseout 		= function(){
        pointer.resetTimeout()
    };


    // add DIV to document
    //
    document.getElementsByTagName("body")[0].appendChild(div);
	
	
	
    // currently no item is highlighted
    //
    this.iHigh = 0;
	
	
	
	
	
	
    // remove list after an interval
    //
    var pointer = this;
    this.toID = setTimeout(function () {
        pointer.clearSuggestions()
    }, this.oP.timeout);
};















_b.AutoSuggest.prototype.changeHighlight = function(key)
{	
    var list = _b.DOM.gE("as_ul");
    if (!list)
        return false;
	
    var n;

    if (key == 40)
        n = this.iHigh + 1;
    else if (key == 38)
        n = this.iHigh - 1;
	
	
    if (n > list.childNodes.length)
        n = list.childNodes.length;
    if (n < 1)
        n = 1;
	
	
    this.setHighlight(n);
};



_b.AutoSuggest.prototype.setHighlight = function(n)
{
    var list = _b.DOM.gE("as_ul");
    if (!list)
        return false;
	
    if (this.iHigh > 0)
        this.clearHighlight();
	
    this.iHigh = Number(n);
	
    list.childNodes[this.iHigh-1].className = "as_highlight";


    this.killTimeout();
};


_b.AutoSuggest.prototype.clearHighlight = function()
{
    var list = _b.DOM.gE("as_ul");
    if (!list)
        return false;
	
    if (this.iHigh > 0)
    {
        list.childNodes[this.iHigh-1].className = "";
        this.iHigh = 0;
    }
};


_b.AutoSuggest.prototype.setHighlightedValue = function ()
{
    if (this.iHigh)
    {
        this.sInp = this.fld.value = this.aSug[ this.iHigh-1 ].value;
		
        // move cursor to end of input (safari)
        //
        this.fld.focus();
        if (this.fld.selectionStart)
            this.fld.setSelectionRange(this.sInp.length, this.sInp.length);
		

        this.clearSuggestions();
		
        // pass selected object to callback function, if exists
        //
        if (typeof(this.oP.callback) == "function")
            this.oP.callback( this.aSug[this.iHigh-1] );
    }
};













_b.AutoSuggest.prototype.killTimeout = function()
{
    clearTimeout(this.toID);
};

_b.AutoSuggest.prototype.resetTimeout = function()
{
    clearTimeout(this.toID);
    var pointer = this;
    this.toID = setTimeout(function () {
        pointer.clearSuggestions()
    }, 1000);
};







_b.AutoSuggest.prototype.clearSuggestions = function ()
{
	
    this.killTimeout();
	
    var ele = _b.DOM.gE(this.idAs);
    var pointer = this;
    if (ele)
    {
        var fade = new _b.Fader(ele,1,0,250,function () {
            _b.DOM.remE(pointer.idAs)
        });
    }
};










// AJAX PROTOTYPE _____________________________________________


if (typeof(_b.Ajax) == "undefined")
    _b.Ajax = {};



_b.Ajax = function ()
{
    this.req = {};
    this.isIE = false;
};



_b.Ajax.prototype.makeRequest = function (url, meth, onComp, onErr)
{
	
    if (meth != "POST")
        meth = "GET";
	
    this.onComplete = onComp;
    this.onError = onErr;
	
    var pointer = this;
	
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest)
    {
        this.req = new XMLHttpRequest();
        this.req.onreadystatechange = function () {
            pointer.processReqChange()
        };
        this.req.open("GET", url, true); //
        this.req.send(null);
    // branch for IE/Windows ActiveX version
    }
    else if (window.ActiveXObject)
    {
        this.req = new ActiveXObject("Microsoft.XMLHTTP");
        if (this.req)
        {
            this.req.onreadystatechange = function () {
                pointer.processReqChange()
            };
            this.req.open(meth, url, true);
            this.req.send();
        }
    }
};


_b.Ajax.prototype.processReqChange = function()
{
	
    // only if req shows "loaded"
    if (this.req.readyState == 4) {
        // only if "OK"
        if (this.req.status == 200)
        {
            this.onComplete( this.req );
        } else {
            this.onError( this.req.status );
        }
    }
};










// DOM PROTOTYPE _____________________________________________


if (typeof(_b.DOM) == "undefined")
    _b.DOM = {};



/* create element */
_b.DOM.cE = function ( type, attr, cont, html )
{
    var ne = document.createElement( type );
    if (!ne)
        return 0;
		
    for (var a in attr)
        ne[a] = attr[a];
	
    var t = typeof(cont);
	
    if (t == "string" && !html)
        ne.appendChild( document.createTextNode(cont) );
    else if (t == "string" && html)
        ne.innerHTML = cont;
    else if (t == "object"){
        $(ne).append( cont );
    }

    return ne;
};



/* get element */
_b.DOM.gE = function ( e )
{
    var t=typeof(e);
    if (t == "undefined")
        return 0;
    else if (t == "string")
    {
        var re = document.getElementById( e );
        if (!re)
            return 0;
        else if (typeof(re.appendChild) != "undefined" )
            return re;
        else
            return 0;
    }
    else if (typeof(e.appendChild) != "undefined")
        return e;
    else
        return 0;
};



/* remove element */
_b.DOM.remE = function ( ele )
{
    var e = this.gE(ele);
	
    if (!e)
        return 0;
    else if (e.parentNode.removeChild(e))
        return true;
    else
        return 0;
};



/* get position */
_b.DOM.getPos = function ( e )
{
    var e = this.gE(e);

    var obj = e;

    var curleft = 0;
    if (obj.offsetParent)
    {
        while (obj.offsetParent)
        {
            curleft += obj.offsetLeft;
            obj = obj.offsetParent;
        }
    }
    else if (obj.x)
        curleft += obj.x;
	
    var obj = e;
	
    var curtop = 0;
    if (obj.offsetParent)
    {
        while (obj.offsetParent)
        {
            curtop += obj.offsetTop;
            obj = obj.offsetParent;
        }
    }
    else if (obj.y)
        curtop += obj.y;

    return {
        x:curleft,
        y:curtop
    };
};










// FADER PROTOTYPE _____________________________________________



if (typeof(_b.Fader) == "undefined")
    _b.Fader = {};





_b.Fader = function (ele, from, to, fadetime, callback)
{	
    if (!ele)
        return 0;
	
    this.e = ele;
	
    this.from = from;
    this.to = to;
	
    this.cb = callback;
	
    this.nDur = fadetime;
		
    this.nInt = 50;
    this.nTime = 0;
	
    var p = this;
    this.nID = setInterval(function() {
        p._fade()
    }, this.nInt);
};




_b.Fader.prototype._fade = function()
{
    this.nTime += this.nInt;
	
    var ieop = Math.round( this._tween(this.nTime, this.from, this.to, this.nDur) * 100 );
    var op = ieop / 100;
	
    if (this.e.filters) // internet explorer
    {
        try
        {
            this.e.filters.item("DXImageTransform.Microsoft.Alpha").opacity = ieop;
        } catch (e) {
            // If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.
            this.e.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity='+ieop+')';
        }
    }
    else // other browsers
    {
        this.e.style.opacity = op;
    }
	
	
    if (this.nTime == this.nDur)
    {
        clearInterval( this.nID );
        if (this.cb != undefined)
            this.cb();
    }
};



_b.Fader.prototype._tween = function(t,b,c,d)
{
    return b + ( (c-b) * (t/d) );
};